Stock-fitting machine



June 5, 1928.

vsi. c. BAXTER STOCK FITTING MACHINE 3 Sheets-Sheet l H a l .V 4.1 c 1xJ l if n June 5, 1928. 1,672,147

w. c. BAXTER STOCK FITTING MACHINE y FIILNov. 7, 1923 3 sheets-sheet 2'l 6466 1.59 /0 i l Z f X' 45 a 76 *l l 2 l ,Ma 11,'7 22 :,L-s

@5I `L`O+ 'l' 62 9o 7 70 s \a6 W 74 /06 l 76 V06 0 /NvE/vmn- June 5,1928. 1,672,147

- w. c. BlAxTr-:R

STOCK FITTING MACHINE Filed Nov '7, l? 5 Sheets-Sheet 3 Patented June 5,1928.

. UNITED STATES PATENT OFFICE.

WILLIAM C. EAXTEEOE BEVERLY, MASSACHUSETTS, ASSIGNOR To UNITED SHOEMACHINERY CoEEoEAT1oN,oE PATEESoN-NEW JERSEY,y A coEroaATmN kor NEWJERSEY.

SToCK-ETTTING MACHINE.

Application ined November 7, 1923. serrai- No. 673,373.

The present invention relates to Stock-fit ting machines and is hereinillustrated as embodied in a machine forskiving counter stiffenerblanks.

A common type of machine for skiving such blanks operates to iex ordistort them and to skive them in their flexed condition. Such a machinemay comprise, for example, a pair of rolls and aknife the edge of Whichis located close to the bite of the rolls, one of the rolls havingformed therein a matrix into which the `blank is forced by thecooperating roll or by other Suitable presser device so asto flex theblank in the desired manner While it is being fed to the knife. Inmachines of this kind, considerable difficulty has been encountered inforcing the blank firm-ly into the matrix at the locality in which thevblank is being operated upon by the knife; and unless the proper liexureof the blank is brought about, the finished stiffener Will notcorrespond exactly to the shape of the matrix. This difficulty inobtaining and maintainingthe proper flexure is due in part at leasttothe fact that the rolls must be of comparatively large diameter, inorder to provide room for the matrix and to provide sufficient strengthto Hex the blank; and Since the knife vmust have con siderable thicknessof stock close to its cutting edge to givek it the required strength,the edge of said knife cannot be located as closely as is desirable tothe Vbite of the rolls.

According to one feature of the invention, v the blank is flexed at alocality spaced 'from y the cutting edge ofthe knife or other tool towhich it is being fed, and means are located between this locality andthe knife, an-d preferably close to the edge of the knife formaintaining this flexure. In the illustrative machine, the blank isflexed at 'a short distance in front of the knife by cooperating matrixand presser rolls of considerable size,` and is then held inv its flexedf condition on the matrix roll by a small presser device Which islocated close to the edge ofthe knife. lith such a construc tion it ispossible to use flexing members of sufficient size and strength toinsure proper flexing of the blank and at the same time to hold theflexed blank firmly in the matrix close to the edge of the knife at the4locality in which the skiving is taking place.

In order to. insure complete flexing of the blank, the presser roll,according to another. feature of the invention, is a patrix roll havinga protuberance which is the reverse of the matrix,.and preferablyanother roll of yielding imaterial is provided to impart a preliminarybend of the blank about the matrix. lVith this construction a verythorough flexing of the blank is secured which greatly facilitates themaintaining of the flexure at the locality in Which'the knife acts uponit. j

Other features of the invention relatey to the use of matrix and patrixrolls so shaped that the blank is fed in the direction of its length,`tothe provision of a rotary tubular knife of large diameter, to grindingmechanism'for the knife, and to certain details of construction andcombinations of parts which will be described as embodied in anillustrative machine and pointed' out in the appended claims.

Referring now to the accompanying drawings:

- Figure l yis a perspective view, partially in section, Showing thegreater lpart of the machine; f f i i Fig. 2 isa vertical,` sectionalview of a portion of the machine; Figf is a perspective view of certainparts shown in Fig. 2;

Fig. ais a-perspective view showing a portion of acoun-ter blank afterit has been lskived and also a .portion of the Waste piece produced bythe skiving operation;

Fig. 5 is a view .in front elevation of the entire machine; and e 1Figs.- 6, 7 and 8 are detail views, partially in section., along thelines 6 6, 7 7 and 8--8 of Fig. 2.

In the drawings a patrix roll iS indicated at 10 and a matrix roll atl2, the patrix roll having a protuberance'M and the matrix roll beingformed with a cavity -16 to cooperate `with the 'protuberance 1,4rtransandfpatrix rolls and to conform the blank more or less to thecontour of the pretuberance 14 before the blank is pressed into thecaivty of the matrix roll. A supply of blanks to be operated upon isstacked one above another in a magazine 22, and the blanks are fed oneby onefrom the bottom of the magazine by means of a reciprocating pusher24, which introduces them between the rolls l0 and 20 in such timedrelation with the other operating parts of the machine that the blankswill register with the cavity in the matrix roll. After advancing beyondthe bite of the rolls l0 and 12, the blank passes beneath a feed roll 26which cooperates with the matrix roll to feed the blank against theskiving knife 28. As shown, the feed roll 26 is provided with a seriesof deep, transverse grooves 30 in its periphery and in each groove thereis located one of a series of yielding presser fingers 32 which functionto hold the blank firmly seated in the cavity of the matrix roll whilethe blank is being operated upon by the skiving knife. The knife 28 is.of the tubular or ring type and consists of an endless, circular bandarranged with its cuttil'ig edge located substantially in the commonaxial plane of the rolls l2 and 26. To permit the cutting edge of theknife 28 to be located relatively to the co-operating rolls l2 and 26,as above described, the periphery of the matrix roll 12 is convexlycurved in an axial direction, as shown in Figs. 6 and 7, to conformsubstantially to the peripheral curvature of the knife, and theperiphery of the feed roll 26 is made concave in an axial direction, asshown, in Fig. 6, to conform to the convexity of the roll l2, thus toinsure more efficient co-operation between said rolls l2 and 26 for thepurpose of feeding the blanks.

The various elements above mentioned are supported by a suitable framecomprising a base 34 and spider-like standards 36 and 38 which rise fromthe base in spaced apart relation at the front and rear of the machine.The patrix roll l() and the matrix roll l2 are fixedy upon horizontalshafts 40 and 42 respectively, while the feed rolls 20 and 26 are fixedupon horizontal shafts 44 and 46 respectively. The shaft 42 of thematrix roll and the shaft 44 of the feed roll 2() are journaled in fixedbearings in the frame. The shaft 40 of the patrix roll is journaled inbearing blocks 48, which are slidable in vertical guideways formed inportions of the frame, one of these guideways being shown at 50 in Fig.l. Springs 52, which are confined in the guideways above the bearingblocks 48, press downwardly upon the latter to hold the patrix rollfirmly in co-operative relation with both the matrix roll and the feedroll 20. The feed roll 26 is journaled in bearing blocks 54, which areslidable in vertical guideways in the frame rshanks 60 and the bearingplate 66.

segments at the rear of the guideways 50 and are pressed downwardly bymeans of springs such as that shown at 56 in Fig. l, these springsmaintaining said feed roll in yielding, co-operative relation with thematrix roll.

The presser fingers 32 depend from rectangular shanks 60, which arevertically disposed in side-by-side relation in a stationary slidebearing 62 supported by the frame. Upward extensions 64 of the shanks 60project through apertures in a fixed, horizontal bearing plate 66, whichis spaced above the slide bearing 62. The presser' fingers 32 areprovided with hook-like lower extremities (F 2 and which embrace thereduced of springs 68 which surround the extensions 64 and are confinedvbetween the rectangular The pressure of the ngers 32 effectively holdsthe blank in the cavity of the matrix roll at points substantially inthe plane of the cutting edge of the knife, and thus insures that thetransverse fiexure imparted to the blank by the rolls l0 and l2 will bemaintained while the blank is being skived.

The tubular skiving knife 28 is made of/ ribbon stock bent in to theformr of a ring, the ends of the stock being butted together and o nelongitudinal edge beveled at its outer side to form the cutting edge ofthe knife. The knife is secured to a rotatable carrier 70 comprising adisk-like structure having a hub 72 splined upon a horizontal shaft 74that is journa-led in bearings 76 in the frame standards 36 and 38.yLongitudinal movement of the shaft 74 in its bearings is prevented bycollars 78, which are fixed on the shaft and bear against opposite endsof the forward bea-ring 76. The tubular knife 28 is expanded against theinterior of a peripheral flange 80 on the knife carrier 7() by means ofa clamping core composed of a plurality of segments 82. 82 are arrangedto engage the inner face of the knife and are secured to the knifecarrier'by means of screws 84 which extend through radial slots 86 inthe knife carrier and are threaded into the core segments 82, the slots86 permitting outward movement of the segments as the clamping core isexpanded to clamp the knife blade in place. The clamping core expandedby means of a collar 88, which encirclcs the hub 72 of the knife carrierand is formed with a conical periphery for engagement with thecorrespondingly inclinedinner faces of the core 82. Screws 90, whichextend through the knife carrier 70 and are threaded into the collar 88,provide means for moving the collar axially, to enable it The segmentsCil to perform itsk corefexpanding function,l and for holding the collarin operative position. After.y the lmife has. been clamped by theexpansion of the core, the core sections 82 may be securely.y held inclamping position by tightening the screws 84. Outward adjustment of theknife blade relatively to the knife carrier may be effected by means ofscrews. 92, which are threaded through the knife carrier in longitudinalalinement with theV knife blade, the inner ends of ythese screwsengaging fslidable spacing blocks 94, which are confined between theperipheries ofthe knife carrier and the expanding core sections and areinterposed between the sere-ws 92 and the. knife blade. The' rearbearing for the knife shaft 74 is formed integralliy with a removableportion of the rear frame standard which isy of somewhat greaterdiameter than the knife carrier and 1s secured tothe fixed portion ofthe frame by means of screws 96. By removing the screws 96, the rearbearingl 7 6 and: the parts integrally'r formed therewith mayv be de'-tached from: the frame to permit the removal of the knife carrier.

The knife shaft 'Z4 is hollow, and a cylindrical block 9.82 that'isslidably mounted within the hollow shaft carries av laterally projectingpin 100, which extends through an elongated, longitudinal slot 102,` inthe shaft and into the hub 72 of the knife carrier.. A spring 106 isconfined within the hollow knife shaft betweenthe slide block 9.8,- andaplug 108 which is threaded at the rear extremity of the shaft. An,adjusting rod 110, having a knu-rled head 112 at' its outer end, extendsthrough the hollow knife shaft intoengagement with the forward end' ofthe slide block 98.A The portion of the adjusting rod 110K adjacent to.its head 112is threaded into the forward end of the knife shaft. Theinner extremity of the rod 110 serves as an adjustable abutment` toprevent forward axial displacement of the knife carrier under theinfluence of the spring 166 and thus to determine the location of theplane of the knife edge relatively to the matrix roll 12 and feed roll26. By means of the above described Construction, the knife carrier,while constrained to Vrotate with the knife shaft,y may nevertheless beadjusted axially in either directionI by turning the adjusting rod 110.

rlhe lniife, the matrix and patrix rolls, and the feed roll-s are drivenfrom a main shaft 116 l(Fig. 5)., which is journaled inv Vof theIpusher.

main shaft 116 'by means of a sprocket chain 126,which passes over' asprocket wheel 128 on the feed wheel shaft 44 and -over- -a s sprocketwheel 130 on the main shaft 116.

A gear 132 is fixed on the feed-roll shaft 44 and meshes with a gear 134which is .fast on shaft 40 that carries the patrix roll. The gear 134meshes with a gear 136, which is fast on the shaft 42 of the matrixroll. The

gear 136, in turn, meshes with a gear 138,

which is fixed on the shaft 46 of the feed roll 26.. l

To permit the blanks to be fed one by one from the bottom of the stackin the magazine 22, the pusher 24, which is mounted to slide in thebottom wall of the magazine,

As shown, the pusher 24 ,is notched at 140 to receive the pointed end ofthe counter blank, this constructionV insuring that the blank will bemaintained under control while it is being fed from the magazine to thefeed roll 20. presentedY 'to the bite of the rolls 10 and. 2() at suchtime that the blanks will thereafter register with the cavity of thematrix roll, provision is made for reciprocating the pusher 24 in timedrelationwith the movement .of the matrix roll. To this endthe pusher 24ispivotally connected with the upper end of a rocker arm 142, and saidarm is connected by a link 144 with the lower end of anr actuating lever`146. The lever 146 is pivoted at 148 to the maga-zine 22, and a portionof the lever extends upwardly beyond thepivot 148 into the path of a pin150 ywhich projects from oner end of the patrix roll. A spring 152,which is secured at one end to a portion of the magazine and at theopposite end to the rocker arm 142, tends to move the pusher rearwardlyto feed a blank from the magazine. At each rotation ofthe patrix roll,the pin 150 engages thelever 146 land swings Iit in a direction to slidethe pusher against the tension of the spring 152 until the blankengaging` end of the pusher has been retracted from beneath the stack invthe magazine to permit the lowermost blank to drop into place in frontis the rotation of the patrix roll-'causes the pin 150 toride off fromthe lever 146, the spring 152 lprojects the pusher through the magazine,thus feeding the lower blank eudwise therefrom and introducing itbetween the rolls 1() and 20. The timing of the forward stroke of thepusher vmay be varied by changing the position of the pin 150 in thepatrix roll, a series of pin-receiv- To insure that the blanks will be fthe pin.

ing holes 154 being provided in the lend of said roll to permit suchadjustment of In order that the length of stroke of the pusher 24 may bevaried in accordance with the length of the blanks to be operated uponand the distance between the magazine and matrix roll, the link 144 iscon nected with the lever 146 by means of a pivot stud 154, which isadjustable in a longitudi nal slot- 156 in the lever 146. The ,stroke ofthe pusher may be lengthened or shortened by adjustment of the pivotstud 154 in the slot 156, thus changing the effective length of thelower arm of said lever.

As each blank passes' between the rolls 10 and 20, the blank islinitially flexed transversely by the action of the rubber roll 2O sothat the blank is preliminarily bent around the protuberance on thepatrix roll and is conformed more or less fully to the transversecurvature thereof. As the blank is gripped between the rolls 10 and 20,said rolls function to feed the blank to the bite of the matrix andpatrix rolls and as the blank passes between the latter the protuberance14 functions to press the blank firmly into the cavity 16 of the matrixroll, as shown in Fig. 7 and thus definitely to determine the portion ofthe blank which is to be removed by the skiving knife. As the blankpasses between the rolls 12 and 26, these rolls function to continue thefeed of the blank to advance it positively against the edge of therotatingknife 28, while the presser lingers 82 engage the portion of theblank which is being acted upon by the skiving knife and hold saidportion firmly seated in the cavity of the matrix roll. Thewaste portionremoved by the ,skivingbperation passesupwardly, as shown 1n Fig. 2.,and esca pes Vthrough an opening 158 in the frame. rf'he skived blankpasses downwardly Iinto a chute 160, which directs it into a suitablereceptacle tnot shown).

To insure that a keen cutting edge shall be presented at all times tothework, the machine is provided with a grinding wheel 162, whichcontinuously maintained in engagement with the beveled edge of theknife, and which is driven continuously throughout the operation of themachine. The grinding wheel 162 is formed with a lateral grindingsurface, which is beveled to produce the desired grinding effect uponthe knife. The grinding wheel is carried by a vertical spindle, which islocated at one side of the vertical axial plane of the knife and whichis made in two parts, an upper section 164, which carries the grindingwheel, and a lower section 166 which carries part of the drivingmechanism for the grinding wheel as will hereinafter appear. The upperspindle section 164 is journaled at its upper end in a bushing 168 thelower end of which carries a thrust collar 170 for engagement with theadjacent end of the hub of the grinding wheel. The bushing 168isscrewthreaded for vertical adjustment in a fixed bracket 172 that issecured to the base 34 of the frame, and a lock nut 174 serves tomaintain said bushing and the thrust `collar 170 in vertically adjustedposition. rThe lower spindle section 166 is journaled in a' suitablebearing in the bracket 172 and is coupled to the upper spindle sectionby a tongue-andgroove connection, shown in Fig. I1 at 176, whereby thetwo parts of the spindle are con strained to rotate in unison but areadapted for a limited amount of lengthwise relative movement. A spring178, which is interposed between the hub of the grinding wheel and acollar 180 on the lower spindle section, tends to separate the spindlesections and to hold the grinding wheel yieldingly against the knife.The lower spindle section carries a friction driving wheel 182 which isdriven from the outer surface of the knife carrier through anintermediate friction wheel 184. The wheel 184 is mounted upon a yoke186, which isfconnected by alined, horizontal pivots with the bracket172, one of saidvpivots being shown at165 in Fig. 1. The intermediatefriction wheel 184 has a fiat, peripheral face for engagement with theexterior of the knife carrier and a beveled face 188 for engagement witha correspondingly beveled face on the friction wheel 182. The frictionwheel 182V is held in operative engagement with the 'intermediate wheel188 by means of a lever 198 pivoted at 192 to the bracket 172 and havingits innerend arranged to engage beneath the hub of the friction wheel182. The outer extremity of the lever 190 is yapertured toreceive avertical Apost 194 threaded at lts upper end to receive an adjusting nut196. The nut 196 may be turned in one direction to depress the outer endof the lever 19() against a spring 198,' which interposed between saidlever andthe bracket 172, and thus to elevate the inner end of saidlever to increase the amount of friction between the roll 184 and theknife carrier andy also between the roll 184 and the frictionfwheel 182.Byturning the nut 196 in the opposite di rection, the spring 198 willraise the louter end of the lever 19() so that'the friction against thedriving members 182 and-184 will be reduced.

A suitable dressing tool 200 may be provided for removing from the knifeany burr produced by the grinding wheel.` As shown, the dressing tool ismounted in va tubular holder 202 fixedly secured to the frameof themachine which is provided with an adjusting screw 204 for moving thedressing tool toward the grinding wheel as the tool wears away.

Although the invention has been set forth as embodied in a particularmachine, it is to be 'understood that the invention Vis not limitedinthe scope of its application to the particular machine which has beenshown and described.

,Having thus described my invention, what I claim :as new and desire tosecure :by-Let` ters Patent of the United States is:

. 1. In `a machine of the class described, means including cooperatingrolls for flexing a piece of stock, means removed from the point ofoperation of said flexing .means for performing a subsequent operationupon a portionof the .stock ioffset by the flexing action, `and meansfor maintaining the flexure yof the stock during the performance of saidsubsequent operation. p

2. In a machine of the vclass K described, means including cooperatingrolls forflexing apiece of stock, means removed. from the point ofoperation vvof said flexing means for performingy a second-operationupon a portion fof the stocky offset yby the 'flexing action, and meanslcopper-ating with a portion of the flexing means for maintaining theflexure of the stock during the performance of said second operation.

3. In .a machine of the class described, means including cooperatingrolls for flexing a piece of stock, means spaced from the pointofoperation vof said flexing means foi removing a portion of thestockloffset by the flexing action, and means for maintainingr the stock inflexed condition while saidportion is being removed.

4.-.. In a stock fitting machine, means for flexing a piece of stock andfeeding it as it is being flexed, means removed from the point ofoperation of said flexing means for removing from the stock a portionoffset by thel flexing operation, and means for maintaining :the flexureof the stock during the removal of said portion therefrom. I

v5. In a machine of the class described, means for flexing an articleand feeding it as it is being flexed, means removed from the point ofoperation of said flexing means for skiving the article to remove aportion offset 'by the flexing operation, and means for'. maintainingythe articlein flexed condi-- tion while it is being skived, said meansbeingeffective to continue. the feed of the article.

6. In a machine lof theV class described. means for .flexing an articleand feeding it as it -is beingflexed, a knife located beyond the pointof operation of said flexing means for skiving the article to remove aportion o'ffsetby the flexing operation, and'means for continuing thefeed of the article to advance it against the knife.

7. In ay machine yofthe class described, matrix and patrix rollsco-operating to flex a piece of stockfed between them, means locatedbeyond the bite of said rolls for removing from the Vstock aportionoffset by the flexingoperation, sind means for maintaining theflexu-re of the stock during the stock removing operation. y

y8. In a machine Aof the class described.,

lmatrix and patrix rolls Vcooperating to feed an article and to flex ittransversely with respect to its direction of feed, and means spacedfrom the point of operation of said l .means located close yto kthecutter' 4fer maintaining the flexure duri-.ng the cutting 'operation.

l0. In a machine of theclass described, a cutter for operating upon apiece ofstock, cooperating matrix and trix rolls so located that theirbite is in rontof and spaced from the cutter, Vand a presser locatedbetween the bite of the rolls and the cutter.

11. In a machine of the class described, matrix and patrix rollsLco-operating to flex an article passed between them, yielding means forengaging the 'article at a point beyond the common axial'plane of saidrolls and pressing the article against one of said rolls to maintain theblank in flexed condi-V tion, and means for skiving the blank tore moveaportion offset by the flexing operation.

12. In a machine of the class described, matrix and patrix rolls`co-operating to flex a piece of lstock passed between them, vaplural-ity of pressure-applying :fingers arranged to co-operate with oneof said rolls to maintain the stock in flexed condition, and means forskiving the stock to .remove a portion offset by the flexing operation.

13. In a machine v of the class described, a cutter, a matrix rolladaptedto support .a pieceV of` stock dur-ing the vcutting operation, arol-l of comparatively large yd1ameter for forcing the piece into thematrix at a point spaced from the edge of` the cutter, anda presser ofsmall cross-section adapted to co-y operate With. the matrix roll andlocated close to the cutter.

14. In a machine ofthe class described, matrix and patrix rollsco-operat-ing-to feed an article and flex it while it is being fed, aknife for skiving the articleafter it has been flexed, and meansincluding a` plurality of pressure-applying fingers arranged tocooperate with one of said rolls to maintain the blank in its flexedcondition while-it is being skived and tocontinue the feed of thearticle to advance it againstv the skiving knife.

15. In a r machiney of 'the class described, matrix and patrix rollscti-operating toflex a blank passed between them, yielding means forpressing` the blank against one of said rolls after it has been flexedto maintain its flexed condition, and a knife located closely adjacentto the point of operation of saidv pressing means for skiving the blankto remove a portion offset by the flexing operation.- i

16. In a machine of the class described, matrix and patrix rollsco-operating to flex a blank'passed between them, means co-operatingwith one of said rolls to maintainV the blank in its flexed conditionafter it leaves the bite of said rolls, a rotary tubular skiving knifearranged with the plane of its cutting edge adjacent to the point ofoperation of said last-named roll and said means, and means for drivingsaid rolls and the knife.

17. In a machine of the class described, matrix and patrix rollsco-operating to flex an article, means co-operating with one of saidrolls to feed the article into the bite of the said rolls, and means forskiving the flexed article to remove portions offset by the flexingoperation.

18. In a machine of the class described, matrix and patrix rollsco-operating to flex an article, means co-operating with the patrix rollto feed the article into the bite of said rolls and to conform thearticle more or less 'to the contour of the patrix roll before thearticle passes between the rolls, and means for skiving the article to'remove portions offset by the flexing operation.

19. In a machine of the class described, matrix and patrix rollsco-operating to flex an-article, a member co-operating with one of saidrolls preliminarily to shape the article to the contour of the latterand to feed the article into the bite of the said rolls, and means forskiving the flexed article to remove portions offset by the flexingoperation.

20. In a machine of the class described, matrix and patrix rollsco-operating to feed an elongated blank lengthwise between them and toflex the blank transversely, a third roll beyond the bite of said rollsco-operat ing with'one of the latter to supplement their feeding action,and a knife arranged with' its cutting edge adjacent tothe bite of saidthird roll and the roll co-operating therewith to scarf the flexedblank.

21. Ina machine of the class described, a matrix roll having a cavity toreceive a blank to be skived, a patrix roll having a protuberancecomplementary to said cavity for pressing the blank into the latter, aknife for skiving the'blank at-a point spaced from the common axialplane of said rolls to remove the portion offset by the flexingoperation, and means co-operating with the matrix roll to feed `theblank against the knife and to hold the blank seated in said cavitywhile .being skived.

22, In a machine of the class described, a matrix roll vhaving aperipheral cavity shaped to receive a counter stiffener blank, thecircumference of said roll being greater than the length of the blankand the length 0f the cavity extending` in a direction transverse to theaxis of the roll, a patrix roll having a protuberance complemental tosaid cavity for co-operating with theV latter to flex the blank, a thirdroll of less diameter. than the matrix roll co-operating with the latterat a point beyond the common axial plane of said rolls to continue thefeed of the blank, and a knife arranged with its `cutting edge closelyadjacent to the common axial plane of the matrix roll and the third rollfor skiving the blank to remove the portions offset by the flexingoperations. i

23. In a machine of the classdescribed, means including a matrix rolland a cooperating roll for feeding and flexing a blank, a knife spacedfrom the locality in which these rolls engage the blank, a transverselygrooved feed roll cooperating with the matrix roll closely adjacent tothe edge of the knife, and presser fingers extending into the o'roovesof the transversely grooved roll for pressing the blank against thematrix roll to maintain the blank in flexed condition during theoperation of the knife.

24. In a machine of the class described, matrix and patrix rollsJo-operating to flex a blank fed between them, means co-operating withone of said rolls to maintain the blank in flexed condition after itleaves the bite of said rolls, a rotary tubular skiving knife arrangedwith the plane of its cutting edge adjacent to the point of operation ofsaid means for skiving the blank to remove portions offset by theflexing operation, and' means for adjusting the knife axially -in eitherdirection.

25, In a machine of the class described, matrix and patrix rollsco-operating to flex a blank .fed between them, means co-operating withYone of said rolls to maintain the blank in its flexed conditionafter itleaves the bite of said rolls, a rotary tubular skiving knifearrangedwith the plane of itscutting edge adjacent tothe point ofoperation of said means for skiving the blank to remove portions offsetby the flexing operation, means for rotating the knife, means Vforsharpening the knife as it rotates, and means for adjusting the kniferelatively to said sharpening means to compensate for the wearing awayof its cutting edge.

26. In a machine ofthe class described, matrix and patrix rollsco-operating to'flex a blank fed between them, means co-operating withone of said rolls to maintain the blank in its flexed condition after itleaves the bite of said rolls, a rotary tubular skiving knife arrangedwith the planefof lits cutting edge adjacent to the point of operationof said means for skiving the blank to remove portions offset by theflexing operation, a grinding wheel for maintaining a sharp cutting edgeupon said knife lthroughout the operation of the machine, and means fordriving the knife, the matrix and patrix rolls, and the grinding wheelcontinuously, throughout the operation of the machine.

27. In a machine of the Class described, matrix and patrix rollsco-operating to flex a blank fed between them, means cooperat ing withone of said rolls to maintain the blank in its flexed condition after itleaves the bite of said rolls, a tubular skiving knife arranged with theplane of its cutting edge adjacent to the point of operation of saidmeans for skiving the blank to removerpor-` tions offset by the flexingoperation, a rotary carrier for said knife, a grinding wheel formaintaining a sharp cutting edge upon said knife throughout theoperation of said machine, positive driving means for said knife carrierand rolls, friction driving connections between the knife Vcarrier andthe grinding wheel, and means for adjusting said connections to vary theamount of friction. I

Q8. In a machine of the class described, matrix and patrix rolls,co-operating to flex a blank fed between them, pressure-applying meansco-operating with one of said rolls to maintain the blank in its flexedcondition, and a knife arranged with its cutting edge closely adjacentto the point of opera- 'tion of said pressure-applying means for skivingthe blank to remove portions offset by the flexing operation.

29. In a machine of the class described, matrix and patrix rollscov-operating to flex a blank fed between them, a third roll cooperatingwith one of said rolls to continue the feed of the blank after -itleaves the bite of said rolls, and a4 skiving knife arranged with itscutting edge closely adjacent to the common axial plane of saidlast-named coupon, means .for removing the blanks one by one from themagazine and introducing them between said rolls in position to registerwith the cavity in the matrix roll, a knife havingits cutting edgeremote from the bite of said rolls for skiving the blanks to remove'aportion offset by the flexing operation, and means for maintaining theblanks in flexed condition while beingy skived.

31. In a machine of the character described, matrix and patrix rollsco-operating to feed and flex a blank, a third roll cooperating with thepatrixk roll to press the blank against the latter before the blank isacted upon by the matrix roll and'to feed the blank into the bite of thematrix and patrix rolls,.means for skiving the blank to remove materialoffset by the flexing operation, a magazine for holding a supply ofblanks to be operated upon, a reciprocating pusher for removing theblanks one at a time from the magazine and introducing them between saidthird rolland the patrix roll, and mechanism for actuating said pusherin such timed relation to the matrix roll that the blankswill registerwith the cavity therein.

3Q. In amachine of the class described, a matrix roll and a presser rollco-operating to flex an article, means for holding an article againstone of said rolls to cause the article to be fed to the bite of therolls, and means for skiving the article to remove portions offset bythe flexing operation.

In testimony whereof I have ysigned my name to this specification.

WILLIAM o.A BAXTER.

